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Posted by Zach on Wednesday, April 21, 2010 at 7:39pm.

How many positive three-digit integers have the property that the tens digit is greater than or equal to the hundreds digit and the ones digit is greater than or equal to the tens digit? Please help :) thanks -Zach

9a

Let a = hundreds, b = tens, c = ones a ≤ b ≤ c Examples of what you are seeking are: 111 112 113... 122 123 124... 133 134 135... 222 223 224... ...999 Unfortunately, I cannot think of an equation to help you solve this problem. Sorry.

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